<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="1.php" method="POST">
        <label for="name">姓名</label>
        <input type="text" name="username" id='name'>
        <br>
        <label>年龄:<input type="text" name='age'></label>
        <br>
        <button>提交</button>
        <button type="button"></button>
        <button type="submit"></button>
    </form>
</body>
</html>